Celebrity breakups and divorces of 2018: All the Hollywood heartbreaks of the year

Ariana Grande's breakup anthem is ringing true throughout Hollywood as 2018 comes to a close: Dozens of high-profile couples chose this year to throw in the towel, from summer flings to decades-long marriages.

The year of heartbreak began with Jennifer Aniston and Justin Theroux, whose divorce announcement came as a sad surprise to well-wishing fans. From there the floodgates were wide open, with failed engagements and messy splits dominating headlines through the calendar year.

HGTV star Jonathan Scott said his split from Jacinta Kuznetsov was mutual, but just eight months later, she got engaged, raising a few eyebrows.

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Biggest celebrity breakups of 2018

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Biggest celebrity breakups of 2018

Jennifer Aniston and Justin Theroux officially ended their marriage in February 2018 after seven years as a couple.

Ariana Grande's whirlwind romance with "Saturday Night Live" comic Pete Davidson started with a summer engagement and ended just as abruptly with an autumn demise.

Paris Hilton was gifted a massive diamond ring upon her engagement to Chris Zylka, but by late 2017, the ring was apparently weighing too heavily on Paris' finger.

Kourtney Kardashian and Younes Bendjima first met in Paris in late 2016, and the following year was filled with luxurious vacations across the globe. But the flame finally burned out in August 2018 after word got out that Younes was cozying up to other women.

Sean "Diddy" Combs and singer Cassie first dated from 2006 to 2008, and they rekindled their love in 2015. But after three years, the two ended things again in 2018.

Michael Sheen and Sarah Silverman dated for four years before ultimately ending on good terms in February 2018.

Zac Brown and his wife Shelly separated in October 2018 after 12 years of marriage.

Ariana Grande and beau Mac Miller split in May 2018 after nearly two years of dating. After confirming their breakup, Ariana attributed the demise of their "toxic" relationship to Mac's issues with substance abuse. Mac died in September 2018 at age 26.

"Property Brothers" star Jonathan Scott and girlfriend Jacinta Kuznetsov, who is a development producer at his own production company, broke up in April 2018.

That was quick! "Real Housewives" star Danielle Staub married Marty Caffrey in May 2018, and by August, they were over.

CNN commentator Van Jones and his wife, Jana, announced in September their separation after nearly 13 years of marriage.

In September 2018, Jeff Garlin filed for divorce from his wife of 24 years, Marla Garlin. The ex-couple shares two sons.

After a highly-publicized relationship (we're talking paparazzi photos every week), Ben Affleck and "SNL" producer Lindsay Shookus called it quits in summer 2018. They didn't make a formal announcement about the breakup -- Ben was just spotted moving on with a Playboy model.

John Cena and fiance Nikki Bella's on-and-off relationship finally came to a definitive halt in April 2018, just one month before their scheduled wedding.

Brooklyn Beckham and Chloe Grace Moretz's breakup featured a healthy dose of drama after Moretz hinted that he'd cheated on her.

Jim Belushi's wife, Jennifer Sloan, filed for divorce in March 2018 after nearly two decades of marriage.

After more than a decade as a couple and two years as husbands, Christian Siriano and Brad Walsh announced their separation in June 2018.

Celebrity fitness trainer Jillian Michaels and fiance Heidi Rhoades broke up in June 2018 after 9 years together.

Jack Osbourne and wife Lisa filed for divorce in May 2018, just months after the birth of their third child.

Miranda Lambert and Anderson East ended her romance just in time for Miranda to move on to her next guy: Musician Evan Felker, whose wife was reportedly blindsided by the relationship.

Jennie Garth and her husband, Dave Abrams, divorced in 2018 after three years of marriage.

Kathy Griffin and her boyfriend of 7 years, Randy Bick, ended things in November 2018. Kathy announced the news on Twitter, writing, "It’s not acrimonious and I will always adore him."

Channing Tatum and Jenna Dewan lasted nearly a decade together in marriage, and they shocked fans with news of their separation in April 2018.

Common and CNN correspondent Angela Rye split in early 2018, with Rye telling press, "We have and will always be friends."

Usher and Grace Miguel wed in September 2015. Two years later, a woman would come forward alleging that in 2017, Usher had infected her with genital herpes. Other accusers also became involved in a lawsuit. The couple announced their separation in March 2018.

Alicia Silverstone and Christopher Jarecki separated in February 2018, and they finalized their divorce in November. As part of their agreement, Silverstone will have to pay Jarecki $12,000 a month in spousal support.

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Paris Hilton and Chris Zylka spent months excitedly talking about their impending nuptials -- “With all the planning I want it to be perfect, and you can’t rush something like this," she said in August -- but their engagement came to a definitive end in November.

At least Hilton and Zylka canceled it with time to spare, in contrast to John Cena and Nikki Bella, who called off their wedding just a month in advance.

See all the breakups in the gallery above, and if you're then feeling a bit pessimistic about the concept of enduring love, we also rounded up the best wedding photos from last year -- see, love is real -- below.

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Celebrity Weddings of 2017

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Celebrity Weddings of 2017

'Dancing with the Stars' alums Peta and Mak tied the knot on July 8: "07~08~2017 was the most ✨magical✨day of my life. I married my soul mate, my perfect man, the only man I could see myself growing old with," she wrote.

How gorgeous was Peta's dress? Truly one of the most beautiful wedding gowns we saw on any celebrity this year.

Erin Andrew made it official with pro hockey player Jarret Stoll in June.

Samira Wiley and Lauren Morelli, who met on set of 'Orange is the New Black,' celebrated their wedding in March with a service in Palm Springs.

Idina Menzel shared this after her big day: "Wanted to let you know... married the love of my life Aaron Lohr this weekend at our home. Dad & son walked me down the aisle. It was magical. Thank you to everyone who helped make my wedding day so special."

Pippa Middleton married James Matthews at St Mark's Church, Englefield Green on May 20, 2017.

Serena Williams and Alexis Ohanian wed in November in one of the highest-profile celebrity weddings of the year! The "Beauty and the Beast" themed night was nothing short of magical.